Niko will meet Mikhail and Dimitri at Perestroika in Broker. Mikhail wants Niko to take out someone he suspects of being a rat, Lenny Petrovic. Dimitri will try to dissuade Mikhail, but he will not listen. As Niko drives towards Lenny's location in Bohan, Mikhail will call Niko, telling him Lenny is at the Guantanamo Ave. train station.

If the player climbs to the platform, Niko will confront Lenny, telling him that Mikhail doesn't like him anymore. Lenny will try to run away, crossing over the train tracks, while his friend attacks Niko with an Uzi. If Lenny gets off the platform, he will get in his Banshee and drive away, and so the player will have to chase him in a vehicle (there's always a Vincent parked across the street). It is possible to kill Lenny before he gets off the platform or in his car.

Another way to kill Lenny without calling his attention, is for the player to enter a nearby building and climb to the rooftop. From the rooftop, he will be close enough for a headshot with any weapon.

A third way to kill Lenny without going after him in a car chase, is to block the stairs on the other station with a vehicle. When he gets to the end of the stairs, he will continuously try to run over to his Banshee, but the blocking car will stop him, giving the player free option to kill Lenny

Once Lenny is dead, Dimitri will call Niko, telling him he just killed the son of a powerful Russian gangster, Kenny Petrovic, to which Niko will respond he was only doing what Faustin told him to do.

You can call to Dimitri during the mission and Niko would ask, should he do it. Dimitri wouldn't call order off, despite the fact of his disagreement with Mikhail.

Trivia

The civilians at the station will only flee when the mission is completed.